One way to solve the problem of solvent contamination and flammability is to replace the thermoplastic acrylic resin coating with a photocurable resin coating, for example, a surface of a polyvinyl chloride agricultural film containing a UV absorber coated with a cationically polymerized UV curable resin. The layer (commonly used cationically polymerized UV curable resin is an epoxy resin and an ultraviolet curable acrylic urethane resin coating.
On one side of the PVC film, a UV-curable acrylic urethane coating containing colloidal silica is applied. The film covers the greenhouse or plastic shed to maintain its dust resistance for a long period of time. In addition, the film is anti-blocking. Sex is also better.
The ultraviolet curable coating contains, in addition to polyurethane (abbreviated as polyurethane), a polymerizable monomer (reactive diluent) and a sensitizer (photoinitiator), and if necessary, an organic solvent and Additives that increase adhesion.
The photopolymerizable acrylic polyurethane suitable for use in the coating may be a polyurethane polyol obtained by reacting a polyether polyol, a polyester polyol or a polyether ester polyol with a polyisocyanate, and then reacting with a polyfunctional isocyanate, and finally The vinyl monomer of the active hydrogen atom is obtained by reaction.
Photo sensitizer is an initiator of photopolymerization, so it is called photoinitiator, sometimes called photosensitizer. Suitable photo sensitizers are benzoin, benzoin methyl ether, benzoin, benzoin, benzoin. Phenyl ether, benzophenone, onion. Naphthoquinone and the like.
If necessary (if the viscosity of the coating is too high), an organic solvent may be added to adjust the viscosity. The applicable solvent is methyl ethyl ketone. Methyl isobutyl ketone, ethyl acetate, butyl acetate; ethanol, isopropanol, toluene and xylene. If the adhesion or construction performance of the coating is not ideal, appropriate additives may be added. The applicable coating additives are organic fluorosurfactants or silicone surfactants. Organic fluorosurfactants can reduce the surface tension of the coating and improve the wettability of the coating. The silicone surfactant is called a coupling agent and also helps to improve the adhesion between the coating and the film.
If the UV-hardened coating is too hard, a small amount of thermoplastic resin may be added to the coating formulation to increase the flexibility of the coating. Suitable thermoplastic resins are polystyrene, polyvinyl chloride, butyl cellulose, rubber, low molecular weight polybutadiene, low molecular weight diallyl phthalate, and the like.
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